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Hydrograph River at a Glance Download
Mississippi River at Canton Lock and Dam 20 Tailwater (ft)Flow (kcfs)Observed: 6.6 ft at 8:00PM Aug 28, 2014Observed: 6.6 ft at 10:00PM Aug 28, 2014Observed: 6.63 ft at 12:00AM Aug 29, 2014Observed: 6.67 ft at 2:00AM Aug 29, 2014Observed: 6.65 ft at 4:00AM Aug 29, 2014Observed: 6.68 ft at 6:00AM Aug 29, 2014Observed: 6.73 ft at 8:00AM Aug 29, 2014Observed: 6.72 ft at 10:00AM Aug 29, 2014Observed: 6.72 ft at 12:00PM Aug 29, 2014Observed: 6.74 ft at 2:00PM Aug 29, 2014Observed: 6.78 ft at 4:00PM Aug 29, 2014Observed: 6.81 ft at 6:00PM Aug 29, 2014Observed: 6.82 ft at 8:00PM Aug 29, 2014Observed: 6.83 ft at 10:00PM Aug 29, 2014Observed: 6.85 ft at 12:00AM Aug 30, 2014Observed: 6.87 ft at 2:00AM Aug 30, 2014Observed: 6.87 ft at 4:00AM Aug 30, 2014Observed: 6.87 ft at 6:00AM Aug 30, 2014Observed: 6.88 ft at 8:00AM Aug 30, 2014Observed: 6.84 ft at 10:00AM Aug 30, 2014Observed: 6.7 ft at 12:00PM Aug 30, 2014Observed: 6.65 ft at 2:00PM Aug 30, 2014Observed: 6.67 ft at 4:00PM Aug 30, 2014Observed: 6.7 ft at 6:00PM Aug 30, 2014Observed: 6.71 ft at 8:00PM Aug 30, 2014Observed: 6.72 ft at 10:00PM Aug 30, 2014Observed: 6.73 ft at 12:00AM Aug 31, 2014Observed: 6.74 ft at 2:00AM Aug 31, 2014Observed: 6.73 ft at 4:00AM Aug 31, 2014Observed: 6.73 ft at 6:00AM Aug 31, 2014Observed: 6.72 ft at 8:00AM Aug 31, 2014Observed: 6.64 ft at 10:00AM Aug 31, 2014Observed: 6.57 ft at 12:00PM Aug 31, 2014Observed: 6.53 ft at 2:00PM Aug 31, 2014Observed: 6.45 ft at 4:00PM Aug 31, 2014Observed: 6.31 ft at 6:00PM Aug 31, 2014Observed: 6.3 ft at 8:00PM Aug 31, 2014Observed: 6.22 ft at 10:00PM Aug 31, 2014Observed: 6.18 ft at 12:00AM Sep 01, 2014Observed: 5.94 ft at 2:00AM Sep 01, 2014Observed: 5.78 ft at 4:00AM Sep 01, 2014Observed: 5.66 ft at 6:00AM Sep 01, 2014Observed: 5.33 ft at 8:00AM Sep 01, 2014Observed: 5.37 ft at 10:00AM Sep 01, 2014Observed: 5.49 ft at 12:00PM Sep 01, 2014Observed: 5.63 ft at 2:00PM Sep 01, 2014Observed: 5.8 ft at 4:00PM Sep 01, 2014Observed: 5.85 ft at 6:00PM Sep 01, 2014Observed: 5.97 ft at 8:00PM Sep 01, 2014Observed: 5.99 ft at 10:00PM Sep 01, 2014Observed: 6.03 ft at 12:00AM Sep 02, 2014Observed: 6.07 ft at 2:00AM Sep 02, 2014Observed: 6.13 ft at 4:00AM Sep 02, 2014Observed: 6.18 ft at 6:00AM Sep 02, 2014Observed: 6.2 ft at 8:00AM Sep 02, 2014Observed: 6.28 ft at 10:00AM Sep 02, 2014Observed: 7.21 ft at 12:00PM Sep 02, 2014Observed: 7.21 ft at 2:00PM Sep 02, 2014Highest Observation: 7.26 ft at 4:00PM Sep 02, 2014Forecast: 6.9 ft 7:00PM Sep 02, 2014Forecast: 7.2 ft 1:00AM Sep 03, 2014Forecast: 7.3 ft 7:00AM Sep 03, 2014Forecast: 7.5 ft 1:00PM Sep 03, 2014Forecast: 7.5 ft 7:00PM Sep 03, 2014Forecast: 7.6 ft 1:00AM Sep 04, 2014Forecast: 7.6 ft 7:00AM Sep 04, 2014Forecast: 7.7 ft 1:00PM Sep 04, 2014Forecast: 7.7 ft 7:00PM Sep 04, 2014Forecast: 7.7 ft 1:00AM Sep 05, 2014Forecast: 7.8 ft 7:00AM Sep 05, 2014Forecast: 7.8 ft 1:00PM Sep 05, 2014Forecast: 7.8 ft 7:00PM Sep 05, 2014Highest Forecast: 7.9 ft 1:00AM Sep 06, 2014Highest Forecast: 7.9 ft 7:00AM Sep 06, 2014Highest Forecast: 7.9 ft 1:00PM Sep 06, 2014Highest Forecast: 7.9 ft 7:00PM Sep 06, 2014Highest Forecast: 7.9 ft 1:00AM Sep 07, 2014Highest Forecast: 7.9 ft 7:00AM Sep 07, 2014Highest Forecast: 7.9 ft 1:00PM Sep 07, 2014Highest Forecast: 7.9 ft 7:00PM Sep 07, 2014Highest Forecast: 7.9 ft 1:00AM Sep 08, 2014Forecast: 7.8 ft 7:00AM Sep 08, 2014Forecast: 7.8 ft 1:00PM Sep 08, 2014Forecast: 7.8 ft 7:00PM Sep 08, 2014Forecast: 7.8 ft 1:00AM Sep 09, 2014Forecast: 7.8 ft 7:00AM Sep 09, 2014Forecast: 7.8 ft 1:00PM Sep 09, 2014Forecast: 7.8 ft 7:00PM Sep 09, 2014Forecast: 7.8 ft 1:00AM Sep 10, 2014Forecast: 7.7 ft 7:00AM Sep 10, 2014Forecast: 7.7 ft 1:00PM Sep 10, 2014Forecast: 7.7 ft 7:00PM Sep 10, 2014Forecast: 7.7 ft 1:00AM Sep 11, 2014Forecast: 7.7 ft 7:00AM Sep 11, 2014Forecast: 7.6 ft 1:00PM Sep 11, 2014Forecast: 7.6 ft 7:00PM Sep 11, 2014Forecast: 7.6 ft 1:00AM Sep 12, 2014Forecast: 7.6 ft 7:00AM Sep 12, 2014Forecast: 7.5 ft 1:00PM Sep 12, 2014Forecast: 7.5 ft 7:00PM Sep 12, 2014Forecast: 7.5 ft 1:00AM Sep 13, 2014Forecast: 7.5 ft 7:00AM Sep 13, 2014Forecast: 7.4 ft 1:00PM Sep 13, 2014Forecast: 7.4 ft 7:00PM Sep 13, 2014Forecast: 7.4 ft 1:00AM Sep 14, 2014Forecast: 7.3 ft 7:00AM Sep 14, 2014Forecast: 7.3 ft 1:00PM Sep 14, 2014Forecast: 7.2 ft 7:00PM Sep 14, 2014Forecast: 7.2 ft 1:00AM Sep 15, 2014Forecast: 7.2 ft 7:00AM Sep 15, 2014Forecast: 7.1 ft 1:00PM Sep 15, 2014Forecast: 7.1 ft 7:00PM Sep 15, 2014Forecast: 7 ft 1:00AM Sep 16, 2014Forecast: 7 ft 7:00AM Sep 16, 2014CANM7(plotting HTIRZ) Graph Created (6:35PM Sep 2, 2014)ObservedForecast (issued 11:32AM Sep 2)Latest observed value: 7.26 ft at 4:00 PM CDT 2-Sep-2014. Flood Stage is 14 ft
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Tabular Data (UTC)
Tabular Data (CDT)
XML Data
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Datum: Not Available
Metadata
NOTE: River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time.

NOTE: Forecasts for the Mississippi River at Canton Lock and Dam 20 are issued routinely year-round.

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Upstream Gauge - at Gregory Landing Upstream Gauge Downstream Gauge Downstream Gauge - at Quincy
Flood Categories (in feet)
Major Flood Stage:25
Moderate Flood Stage:20
Flood Stage:14
Action Stage:12

Historical Crests
(1) 27.88 ft on 07/09/1993
(2) 27.73 ft on 06/18/2008
(3) 24.50 ft on 04/24/1973
(4) 23.43 ft on 07/07/2014
(5) 23.20 ft on 05/15/2001
(6) 23.19 ft on 04/21/2013
(7) 21.42 ft on 05/01/1965
(8) 20.92 ft on 10/04/1986
(9) 20.82 ft on 04/03/1960
(10) 20.48 ft on 06/01/2013
Show More Historical Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) -4.00 ft on 12/26/1933
(2) -3.80 ft on 01/02/1934
(3) -3.60 ft on 12/14/1936
(4) -2.90 ft on 12/13/1937
(5) -2.80 ft on 01/17/1938
Show More Low Water Records
Zoom Level:16
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Gauge LocationGauge Map Marker
Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
110000 At this approximate discharge, the Corps will raise the gates out of the water, creating "open river" conditions.
27 Water reaches the top of the lower gates.
26 The Lock and Dam 20 Control Center begins flooding at this height.
25.7 The Illinois levee protecting Meyer, IL is overtopped. The town of Meyer begins flooding.
24.5 Lock and Dam 20 maintenance buildings begin flooding.
23.5 Route B is closed from Poage Street in LaGrange to the south side of the LaGrange city limits near this height. This makes Route C the only way into and out of town.
20 Flood waters reach the top of the upper gates.
19.5 In La Grange, Highway B begins to flood and is closed south of Route C.
19.39 Water reaches the top of the lock wall, flooding the lock chamber.
19.3 Drainage District begins to fill up.
18.7 In La Grange, 2nd Street floods between Green St. and Lewis St.
18.6 In La Grange, Green Street floods.
18.2 In La Grange, MO, Bunge Car Park begins to flood.
18 Near this level, the lock is closed to navigation. This level will vary with circumstance. Also, Main Street leading to the lock and dam and the railroad crossing at Henderson Street flood at this height.
17.6 In La Grange, MO, the entrance to Mark Twain Casino parking lot begins to flood. Alternate entrance is used. Also, water reaches the base of area levees.
17.5 State Highway B, or Business U.S. Highway 61, is closed from Missouri Highway 16 in Canton to north of Canton at the levee flood gate near this level.
16.8 Burlington Northern/Sante Fe railroad tracks are overtopped.
16.6 Front Street leading to the campground and RV park floods at this height.
14 Both banks begin to overflow. Minor damages begin.
9 Above 8.7 to 9.2 feet, the Corps will raise the gates out of the water, allowing for "open river" conditions. This corresponds to a discharge of approximately 110,000 cfs.
8.5 The Corps will not allow the pool level to drop below 8.5 feet (higher flows below 100K). At low flows, they allow a 2-foot variation between 11.0 and 13.0 feet. At higher flows below 100K, the range is actually lower, between 8.5 and 10.5 feet. Above 110K cfs, the gates are raised above the water surface, allowing open river conditions.
Photos
(1) Canton riverfront with a stage of 23.05 on 19 June 2008.
(2) Canton riverfront on 19 June 2008 with a stage of 23.05 ft.
(3) Looking NE at the Canton Lock and Dam 20 on 19 June 2008. HT=23.05 feet.
(4) Flooded farm near Meyer, IL on 19 June 2008 with a stage of 23 feet.
(5) Levee break on the Illinois side across from Canton, MO on 19 June 2008. Stage was 23 feet.
(6) Knox Street in LaGrange with 2nd Street in the distance near flood at 18.2 feet on June 25, 2010.
(7) Flooded parking at Bunge near BNSF tracks in LaGrange on June 25, 2010 with a stage of 18.2 feet.
(8) Henderson Street leading to the lock and dam at the railroad crossing on June 25, 2010 at 18.15 feet
(9) East parking lot at Terrible's Casino in LaGrange on June 25, 2010 with a stage of 18.2 feet.
(10) West parking lot at Terrible's Casino in LaGrange at a stage of 18.2 feet on June 25, 2010
(11) BNSF railroad tracks looking north toward the lock and dam on June 25, 2010 at 18.15 feet.
(12) Mississippi RV Park outlets at Canton on June 25, 2010 at a stage of 18.15 feet.
(13) Front Street leading to campground hookups on June 25, 2010 at a stage of 18.15 feet.
(14) Aerial View
(15) Upstream View
(16) Downstream View
(17) Pool View (US from Dam)
(18) Tailwater Overview
(19) Tailwater View
About This Location Collapse

Latitude: 40.140833° N, Longitude: 91.515278° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 14 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
Elevation
(gauge height = flood stage)
Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other 468.5 ft 482.5 ft Datum of 1912

Current/Historical Observations:

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St. Charles, MO 63304
(636) 441-8467
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Page last modified: 27-Aug-2014 7:11 PM
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